CN110868047B - Power supply control method, envelope tracking power supply and electronic equipment - Google Patents
Power supply control method, envelope tracking power supply and electronic equipment Download PDFInfo
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- CN110868047B CN110868047B CN201911166313.3A CN201911166313A CN110868047B CN 110868047 B CN110868047 B CN 110868047B CN 201911166313 A CN201911166313 A CN 201911166313A CN 110868047 B CN110868047 B CN 110868047B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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Abstract
The invention relates to the technical field of communication, and provides a power supply control method, an envelope tracking power supply and electronic equipment, wherein the method comprises the following steps: acquiring the output voltage of a power switch circuit; under the condition that the output voltage of the power switch circuit is greater than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a target time T, wherein T is T plus delta T, T is the time when the output voltage of the power switch circuit is greater than the first preset voltage value, and delta T is preset duration; under the condition that the input end of the power switch circuit is controlled to input the closing signal, if the output voltage of the power output end is smaller than a second preset voltage value, the input end of the power switch circuit is controlled to stop inputting the closing signal, and the input end of the power switch circuit is controlled to input the output voltage of the error amplification circuit. The embodiment of the invention can improve the efficiency of the radio frequency PA.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a power control method, an envelope tracking power supply, and an electronic device.
Background
With the development of high-speed mobile communication, the peak-to-average ratio of radio frequency signals is higher. In the case of a high average peak ratio of the rf signal, a higher supply voltage and a higher instantaneous supply current are required for the rf PA (Power Amplifier) under the same average Power. But increasing the supply voltage only for the higher peak-to-average signal portion makes the rf PA less efficient.
Disclosure of Invention
The embodiment of the invention provides a power supply control method, an envelope tracking power supply and electronic equipment, and aims to solve the problem of low efficiency of a radio frequency PA.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a power supply control method, which is applied to an envelope tracking power supply, where the envelope tracking power supply includes an error amplification circuit, a power switch circuit, and a power output terminal, and the power switch circuit is connected to the power output terminal via an inductor, where the method includes:
acquiring the output voltage of the power switch circuit;
under the condition that the output voltage of the power switch circuit is greater than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a target time T, wherein T is T + delta T, T is the time when the output voltage of the power switch circuit is greater than the first preset voltage value, and delta T is preset duration;
under the condition that the input end of the power switch circuit is controlled to input the closing signal, if the output voltage of the power output end is smaller than a second preset voltage value, the input end of the power switch circuit is controlled to stop inputting the closing signal, and the input end of the power switch circuit is controlled to input the output voltage of the error amplification circuit.
In a second aspect, an embodiment of the present invention provides an envelope tracking power supply, which includes an error amplification circuit, a power switch circuit, and a power output terminal, where the power switch circuit is connected to the power output terminal via an inductor, and the envelope tracking power supply further includes:
a first acquisition unit configured to acquire an output voltage of the power switching circuit;
the power supply control circuit comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for controlling the input end of the power supply switch circuit to input a closing signal at a target time T under the condition that the output voltage of the power supply switch circuit is greater than a first preset voltage value, T is T + delta T, T is the time when the output voltage of the power supply switch circuit is greater than the first preset voltage value, and delta T is preset time length;
and the second control unit is used for controlling the input end of the power switch circuit to stop inputting the closing signal and controlling the input end of the power switch circuit to input the output voltage of the error amplification circuit if the output voltage of the power output end is smaller than a second preset voltage value under the condition of controlling the input end of the power switch circuit to input the closing signal.
In a third aspect, an embodiment of the present invention provides an envelope tracking power supply, including: the device comprises a power supply input end, a linear amplifying circuit, an error amplifying circuit, a control module, a power supply switch circuit, an inductor and a power supply output end;
the first input end of the linear amplification circuit is connected with the power supply input end, and the second input end of the linear amplification circuit is connected with the power supply output end;
the first input end of the error amplifying circuit is connected with the output end of the linear amplifying circuit, and the second input end of the error amplifying circuit is connected with the power supply output end;
the first input end of the control module is connected with the output end of the error amplification circuit, the second input end of the control module is connected with the power supply output end, and the third input end of the control module is connected with the output end of the power supply switch circuit;
the input end of the power switch circuit is connected with the output end of the control module, and the output end of the power switch circuit is connected with the power output end through an inductor.
In a fourth aspect, an embodiment of the present invention provides an envelope tracking power supply, including: a memory, a processor and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps in the power control method according to the first aspect.
In a fifth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the power supply control method according to the first aspect.
In the embodiment of the invention, the output voltage of the power switch circuit is obtained; under the condition that the output voltage of the power switch circuit is greater than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a target time T; under the condition that the input end of the power switch circuit is controlled to input the closing signal, if the output voltage of the power output end is smaller than a second preset voltage value, the input end of the power switch circuit is controlled to stop inputting the closing signal, and the input end of the power switch circuit is controlled to input the output voltage of the error amplification circuit. Therefore, when the amplitude of the transmitted signal is different, the voltage output by the power output end of the envelope tracking power supply is also different, so that the power supply voltage of the radio frequency PA is changed along with the amplitude of the transmitted signal, and the efficiency of the radio frequency PA can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a power control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an envelope tracking power supply according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a curve of a corresponding relationship between an output voltage at an output terminal of a power supply and time in an envelope tracking power supply according to an embodiment of the present invention;
fig. 4 is a second schematic diagram of the envelope tracking power supply according to the embodiment of the present invention;
fig. 5 is a third schematic structural diagram of an envelope tracking power supply according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a power control method according to an embodiment of the present invention, where the method is applied to an envelope tracking power supply, as shown in fig. 2, where the envelope tracking power supply includes an error amplification circuit 3, a power switch circuit 5, and a power output terminal 6, and the power switch circuit 5 is connected to the power output terminal 6 via an inductor L1, as shown in fig. 1, and the method includes the following steps:
and 101, acquiring the output voltage of the power switch circuit.
Taking the schematic structure of the envelope tracking power supply shown in fig. 2 as an example, the power switch circuit 5 may include a first control switch Q1, a second control switch Q2, and an inverter 51; a first terminal of the first control switch Q1 is connected to the output terminal of the control module 4, a second terminal of the first control switch Q1 is used for inputting a supply voltage, and a third terminal of the first control switch Q1 is connected to the first terminal of the inductor L1; the input end of the inverter 51 is connected to the output end of the control module 4, the output end of the inverter 51 is connected to the first end of the second control switch Q2, the second end of the second control switch Q2 is used for grounding, and the third end of the second control switch Q2 is connected to the first end of the inductor L1. The output voltage of the power switch circuit 5 may be a voltage value of the third terminal of the first control switch Q1.
The first preset voltage value may be an output voltage value of the power switch circuit 5 in an on state. The first preset voltage value may be high level, for example, 3V, or 3.5V, etc. Taking the schematic structure of the envelope tracking power supply shown in fig. 2 as an example, the first preset voltage value may be related to the power supply voltage input to the second terminal of the first control switch Q1, and the first preset voltage value may be a voltage value output from the third terminal of the first control switch Q1 when the first control switch Q1 is turned on. For example, in the case that the supply voltage input to the second terminal of the first control switch Q1 is 5V, the first preset voltage value may be 3.5V. The off signal may be a low level, and when the input end of the power switch circuit 5 is controlled to input the off signal, the power switch circuit 5 is turned off, and the power switch circuit 5 may output the low level. When the input end of the power switch circuit 5 is controlled to input a closing signal, the first end of the first control switch Q1 is at a low level, the first control switch Q1 is closed, and the third end of the first control switch Q1 outputs a low level; the input terminal of the inverter 51 inputs a low level, the output terminal of the inverter 51 outputs a high level, and the first terminal of the second control switch Q2 is at a high level, so that the first terminal of the inductor L1 is conducted with the ground, and the power switch circuit 5 outputs a low level.
In addition, a suitable value of Δ t may be used to reduce the output ripple of the envelope tracking power supply. Due to the time delay of the inductor L1, when the power switch circuit 5 outputs a low level to the first end of the inductor L1, the induced current of the inductor L1 cannot change suddenly, and the output voltage of the power output terminal 6 will continue to increase to reach the peak voltage of the envelope tracking power supply. If the input end of the power switch circuit 5 is not controlled to input a shutdown signal at the target time T, when the error amplification circuit 3 detects that the output voltage of the power output end 6 is higher than the envelope signal voltage output by the output end of the linear amplification circuit 2, the output end of the error amplification circuit 3 outputs the shutdown signal to the input end of the power switch circuit 5, that is, the output end of the power switch circuit 5 is controlled to be at a low level, due to the time delay effect of the inductor L1, the output voltage of the power output end 6 will continue to increase, so that the output ripple of the envelope tracking power supply is increased, and the output ripple is coupled to the radio frequency PA, which may affect the performance of sending the radio frequency signal. By acquiring the output voltage of the power switch circuit 5, the input end of the power switch circuit 5 is controlled to input a turn-off signal at the target time T, and the feedback of the control end of the power switch circuit 5 is added to the first end of the inductor L1, so as to control the on and off of the power switch circuit 5. Before the output end of the error amplifying circuit 3 controls the output end of the power switch circuit 5 to output a low level, the input end of the power switch circuit 5 is controlled to input a closing signal at a target time T, so that the output end of the power switch circuit 5 is controlled to be the low level in advance. The output ripple of the envelope tracking power supply can be reduced, the performance of receiving and sending radio frequency signals is optimized, and the power consumption of a system can be reduced. The Δ t value may be preset, may be set according to an empirical value, or may be continuously adjusted, and an appropriate Δ t value is selected according to the adjustment result, so that the output ripple of the envelope tracking power supply is small.
And 103, under the condition that the input end of the power switch circuit is controlled to input the closing signal, if the output voltage of the power output end is smaller than a second preset voltage value, controlling the input end of the power switch circuit to stop inputting the closing signal, and controlling the input end of the power switch circuit to input the output voltage of the error amplification circuit.
The second preset voltage value may be related to the voltage input by the power input end 1, for example, the second preset voltage value may be in a proportional relationship with the voltage input by the power input end 1, or the second preset voltage value may be a maximum value of the voltage input by the power input end 1, and preferably, the second preset voltage value is selected according to a debugging result through continuous debugging, so that the effect that the power output of the envelope tracking power supply follows the power input is better. And under the condition that the output voltage of the power output end 6 is smaller than a second preset voltage value, controlling the input end of the power switch circuit 5 to input the output voltage of the error amplification circuit 3, namely, outputting the output voltage of the error amplification circuit 3 to the input end of the power switch circuit 5.
In the case where the output voltage of the power output terminal 6 rises quickly, that is, the rising rate of the output voltage of the power output terminal 6 is high, the output voltage of the error amplifying circuit 3 outputs the off signal before the target time T, and the off signal may be directly output to the input terminal of the power switch circuit 5 to control the power switch circuit 5 to be turned off.
In the embodiment of the invention, the output voltage of the power switch circuit is obtained; under the condition that the output voltage of the power switch circuit is greater than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a target time T; under the condition that the input end of the power switch circuit is controlled to input the closing signal, if the output voltage of the power output end is smaller than a second preset voltage value, the input end of the power switch circuit is controlled to stop inputting the closing signal, and the input end of the power switch circuit is controlled to input the output voltage of the error amplification circuit. Therefore, when the amplitude of the transmitted signal is different, the voltage output by the power output end of the envelope tracking power supply is also different, so that the power supply voltage of the radio frequency PA is changed along with the amplitude of the transmitted signal, and the efficiency of the radio frequency PA can be improved.
As an optional implementation, before the obtaining the output voltage of the power switching circuit, the method further includes:
controlling the input end of the power switch circuit to input the output voltage of the error amplifying circuit;
acquiring the output voltage of the power switch circuit;
taking a first time T1 as a time starting point, acquiring a corresponding relation between the output voltage of the power supply output end and time, wherein T1 is the time when the output voltage of the power supply switch circuit is greater than a third preset voltage value;
and obtaining delta t according to the corresponding relation between the output voltage of the power supply output end and the time.
Before the output voltage of the power switch circuit 5 is obtained, a proper delta t value can be obtained according to a debugging result through continuous debugging. The input terminal of the power switch circuit 5 is controlled to input the output voltage of the error amplification circuit 3, that is, the output voltage of the error amplification circuit 3 is output to the input terminal of the power switch circuit 5. The third preset voltage value may be an output voltage value of the power switch circuit 5 in an on state. The third preset voltage value may be high level, for example, 3V, or 3.5V, etc. Taking the schematic structure of the envelope tracking power supply shown in fig. 2 as an example, the third preset voltage value may be related to the power supply voltage input to the second terminal of the first control switch Q1, and the third preset voltage value may be a voltage value output from the third terminal of the first control switch Q1 when the first control switch Q1 is turned on. For example, in the case that the supply voltage input to the second terminal of the first control switch Q1 is 5V, the third preset voltage value may be 3.5V. The third preset voltage value may be the same as the first preset voltage value, or may be different from the first preset voltage value.
The first time T1 may be a time when the power switch circuit 5 is turned from an off state to an on state, that is, a time when the voltage at the third terminal of the first control switch Q1 is changed from a low level to a high level. The corresponding relationship between the output voltage of the power output terminal 6 and the time is obtained by taking the first time T1 as a time starting point, and may be obtained by starting to record the relationship between the output voltage of the power output terminal 6 and the time when the power switch circuit 5 is changed from the off state to the on state, or by measuring through a voltmeter, or by measuring through an oscilloscope. For a more intuitive view, the output voltage of the power supply output terminal 6 with respect to time can be output in the form of a curve. In order to improve the reliability of the data, as shown in fig. 3, a curve of the output voltage of the power output terminal 6 with respect to time may be obtained through multiple tests, and the curve obtained through the multiple tests may be fitted to obtain a fitted curve, in fig. 3, the fitted curve is represented by a dotted line, and the fitted curve is taken as a curve representing a relationship between the output voltage of the power output terminal 6 and time. Where tb denotes a time point at which the error amplification circuit 3 outputs the off signal to the input terminal of the power switch circuit 5, and ta denotes a target time T.
It should be noted that, Δ T is obtained according to the corresponding relationship between the output voltage of the power output end 6 and time, a time interval between a time corresponding to a peak voltage in the output voltage of the power output end 6 and T1 may be obtained, the time interval is taken as a second time duration, and Δ T may be positively correlated with the second time duration, for example, Δ T may be one half of the second time duration, or may be three quarters of the second time duration. Or, the Δ T is obtained according to the corresponding relationship between the output voltage of the power output terminal 6 and time, where a time interval between a time corresponding to a peak voltage in the output voltage of the power output terminal 6 and T1 is obtained, an initial value of the Δ T is obtained according to the time interval, the initial value of the Δ T is adopted for debugging, the Δ T is continuously updated, and the Δ T where the output ripple of the envelope tracking power supply is lower than the preset value is taken as the Δ T in step 102.
In this embodiment, Δ t is obtained according to the corresponding relationship between the output voltage of the power output terminal and time, and a close signal is input to the input terminal of the power switch circuit in advance before the output terminal of the error amplification circuit controls the power switch circuit to close, so as to further reduce the output ripple of the envelope tracking power supply and optimize the performance of receiving and sending the radio frequency signal.
As an optional implementation manner, the envelope tracking power supply further includes a power supply input terminal, and the obtaining Δ t according to a corresponding relationship between an output voltage of the power supply output terminal and time includes:
acquiring a first time length delta t2 according to the corresponding relation between the output voltage of the power supply output end and the time;
under the condition that the output voltage of the power switch circuit is larger than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a second time T2, wherein T2 is T + delta T2;
updating the first time length Δ t2 when a difference between an output voltage of the power supply output terminal and a target voltage is greater than a fourth preset voltage value, wherein the target voltage is in a proportional relation with an input voltage of the power supply input terminal;
and setting the value of the preset time length delta t as the first time length delta t2 under the condition that the difference value between the output voltage of the power supply output end and the target voltage is less than or equal to the fourth preset voltage value.
The first time length may be obtained according to a corresponding relationship between the output voltage of the power output terminal 6 and time, the initial value of Δ t may be obtained according to the first time length, the initial value of Δ t may be adopted for debugging, and Δ t may be updated continuously, so as to obtain a suitable Δ t as Δ t in step 102. The first time length Δ t2 is obtained according to the corresponding relationship between the output voltage of the power output terminal 6 and time, which may be a time interval between the time corresponding to the peak voltage in the output voltage of the power output terminal 6 and t, and the first time length Δ t2 may be positively correlated with the time interval, for example, the first time length Δ t2 may be one half of the time interval, or may be three quarters of the time interval. In order to make the output ripple of the envelope tracking power supply smaller, the fourth preset voltage value may be a positive number, and the smaller the value of the fourth preset voltage value is, the smaller the output ripple of the envelope tracking power supply is. The target voltage and the input voltage of the power input end 1 are in a proportional relation, a specific proportional value can be related to a circuit structure parameter of the envelope tracking power supply, and the specific proportional value can be obtained by measuring the relation between the input voltage of the power input end 1 and the output voltage of the power output end 6 for multiple times.
In addition, the updating of the first time length Δ t2 may be updating the first time length Δ t2 according to a preset algorithm, or updating the first time length Δ t2 according to a bisection method, for example, when the difference between the output voltage of the power output terminal 6 and the target voltage is greater than a fourth preset voltage value due to Δ t2, the value of Δ t2 is too large, half of the value of Δ t2 may be regarded as Δ t2 after the first updating, and debugging of Δ t2 after the first updating may be continued. If the difference between the output voltage of the power output terminal 6 and the target voltage is smaller than zero due to the Δ t2 after the first update, it indicates that the value of Δ t2 after the first update is too small, and the debugging can be continued by taking half of the sum of Δ t2 before the first update and Δ t2 after the first update as Δ t2 after the second update. Until the difference between the output voltage of the power output terminal 6 and the target voltage is less than or equal to the fourth preset voltage value, taking at 2 as at this time.
In this embodiment, when the difference between the output voltage of the power supply output terminal and the target voltage is greater than a fourth preset voltage value, the first time period Δ t2 is updated; and under the condition that the difference value between the output voltage of the power supply output end and the target voltage is smaller than or equal to the fourth preset voltage value, setting the value of the preset time length delta t as the first time length delta t2, so that better delta t2 is obtained through continuous debugging, the output ripple of the envelope tracking power supply can be further reduced, and the performance of receiving and sending radio frequency signals is optimized.
Referring to fig. 4, fig. 4 is a diagram of an envelope tracking power supply according to an embodiment of the present invention, where the envelope tracking power supply includes an error amplification circuit, a power switch circuit, and a power output terminal, the power switch circuit is connected to the power output terminal via an inductor, and the envelope tracking power supply 200 further includes:
a first obtaining unit 201, configured to obtain an output voltage of the power switch circuit;
a first control unit 202, configured to control an input end of the power switch circuit to input a turn-off signal at a target time T when an output voltage of the power switch circuit is greater than a first preset voltage value, where T is T + Δ T, T is a time when the output voltage of the power switch circuit is greater than the first preset voltage value, and Δ T is a preset time duration;
and a second control unit 203, configured to, under a condition that the input end of the power switch circuit is controlled to input the shutdown signal, if the output voltage of the power output end is smaller than a second preset voltage value, control the input end of the power switch circuit to stop inputting the shutdown signal, and control the input end of the power switch circuit to input the output voltage of the error amplification circuit.
Optionally, as shown in fig. 5, the envelope tracking power supply 200 further includes:
a third control unit 204, configured to control an input terminal of the power switch circuit to input the output voltage of the error amplification circuit;
a second obtaining unit 205 configured to obtain an output voltage of the power switching circuit;
a third obtaining unit 206, configured to obtain a corresponding relationship between the output voltage of the power output terminal and time by taking a first time T1 as a time starting point, where T1 is a time when the output voltage of the power switch circuit is greater than a third preset voltage value;
a fourth obtaining unit 207, configured to obtain Δ t according to a corresponding relationship between the output voltage of the power output terminal and time.
Optionally, the envelope tracking power supply 200 further includes a power input end, and the fourth obtaining unit 207 is specifically configured to:
acquiring a first time length delta t2 according to the corresponding relation between the output voltage of the power supply output end and the time;
under the condition that the output voltage of the power switch circuit is larger than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a second time T2, wherein T2 is T + delta T2;
updating the first time length Δ t2 when a difference between an output voltage of the power supply output terminal and a target voltage is greater than a fourth preset voltage value, wherein the target voltage is in a proportional relation with an input voltage of the power supply input terminal;
and setting the value of the preset time length delta t as the first time length delta t2 under the condition that the difference value between the output voltage of the power supply output end and the target voltage is less than or equal to the fourth preset voltage value.
The envelope tracking power supply can implement each process implemented by the envelope tracking power supply in the method embodiment of fig. 1, and is not described herein again to avoid repetition.
Referring to fig. 2, fig. 2 is a diagram of an envelope tracking power supply according to an embodiment of the present invention, including: the device comprises a power input end 1, a linear amplifying circuit 2, an error amplifying circuit 3, a control module 4, a power switch circuit 5, an inductor L1 and a power output end 6;
a first input end of the linear amplification circuit 2 is connected with the power supply input end 1, and a second input end of the linear amplification circuit 2 is connected with the power supply output end 6;
a first input end of the error amplifying circuit 3 is connected with an output end of the linear amplifying circuit 2, and a second input end of the error amplifying circuit 3 is connected with the power output end 6;
a first input end of the control module 4 is connected with an output end of the error amplifying circuit 3, a second input end of the control module 4 is connected with the power output end 6, and a third input end of the control module 4 is connected with an output end of the power switch circuit 5;
the input end of the power switch circuit 5 is connected with the output end of the control module 4, and the output end of the power switch circuit 5 is connected with the power output end 6 through an inductor L1.
The power input terminal 1 may be configured to input a transmission signal, and the transmission signal may be an envelope signal. The linear amplifying circuit 2 may include a linear envelope amplifier 21, and may compare a voltage difference value between a first input terminal and a second input terminal of the linear amplifying circuit 2, and when the voltage value of the first input terminal of the linear amplifying circuit 2 is higher than the voltage value of the second input terminal of the linear amplifying circuit 2, the output terminal of the linear amplifying circuit 2 may output an envelope signal to the first input terminal of the error amplifying circuit 3; when the voltage value of the first input terminal of the linear amplification circuit 2 is higher than the voltage value of the second input terminal of the linear amplification circuit 2, the linear amplification circuit 2 turns off the output. The error amplifying circuit 3 is configured to turn on the power switch circuit 5, when the output power of the output terminal of the linear amplifying circuit 2 is not enough to support the load, the output voltage of the power output terminal 6 is pulled low, which may cause a voltage difference between the first input terminal of the error amplifying circuit 3 and the second input terminal of the error amplifying circuit 3 to become large, and when the control module 4 controls the input terminal of the power switch circuit 5 to input the output voltage of the error amplifying circuit 3, the error amplifying circuit 3 may turn on the power switch circuit 5.
In addition, the power switching circuit 5 and the inductor L1 are used to increase the output voltage at the power output terminal 6 to provide an envelope tracking power supply primary power output. When the power switch circuit 5 is in an on state, the output voltage of the power output terminal 6 is increased. The power switching circuit 5 may be a buck DC-DC circuit. When the power switch circuit 5 is in the on state, the power switch circuit 5 may output a high level to the first terminal of the inductor L1, and when the power switch circuit 5 is in the off state, the power switch circuit 5 may output a low level to the first terminal of the inductor L1. The control module 4 may include an a/D circuit, and the output voltage of the power output terminal 6 is obtained through the a/D circuit, the control module 4 may further include a single chip microcomputer, or a complex programmable logic device CPLD, or a field programmable gate array FPGA, and each step in the embodiment of the method illustrated in fig. 1 may be executed through the control module 4.
It should be noted that the control module 4 may be configured to perform:
acquiring the output voltage of the power switch circuit 5;
under the condition that the output voltage of the power switch circuit 5 is greater than a first preset voltage value, controlling the input end of the power switch circuit 5 to input a turn-off signal at a target time T, wherein T is T + Δ T, T is the time when the output voltage of the power switch circuit 5 is greater than the first preset voltage value, and Δ T is a preset duration;
under the condition that the input end of the power switch circuit 5 is controlled to input the closing signal, if the output voltage of the power output end 6 is smaller than a second preset voltage value, the input end of the power switch circuit 5 is controlled to stop inputting the closing signal, and the input end of the power switch circuit 5 is controlled to input the output voltage of the error amplification circuit 3.
Optionally, the control module 4 may be further configured to:
the input end of the power switch circuit 5 is controlled to input the output voltage of the error amplifying circuit 3;
acquiring the output voltage of the power switch circuit 5;
taking a first time T1 as a time starting point, obtaining a corresponding relation between the output voltage of the power output terminal 6 and time, wherein T1 is a time when the output voltage of the power switch circuit 5 is greater than a third preset voltage value;
and obtaining delta t according to the corresponding relation between the output voltage of the power supply output end 6 and the time.
Optionally, the envelope tracking power supply further includes a power input terminal 1, and the obtaining, by the control module 4, Δ t according to the corresponding relationship between the output voltage of the power output terminal 6 and time includes:
obtaining a first time length delta t2 according to the corresponding relation between the output voltage of the power supply output end 6 and the time;
when the output voltage of the power switch circuit 5 is greater than a first preset voltage value, controlling the input end of the power switch circuit 5 to input a turn-off signal at a second time T2, wherein T2 is T + Δ T2;
when the difference between the output voltage of the power output end 6 and the target voltage is greater than a fourth preset voltage value, updating the first time length Δ t2, wherein the target voltage is in a proportional relation with the input voltage of the power input end 1;
and when the difference between the output voltage of the power supply output end 6 and the target voltage is smaller than or equal to the fourth preset voltage value, setting the value of the preset time length Δ t as the first time length Δ t 2.
Optionally, the power switch circuit 5 includes a first control switch Q1, a second control switch Q2, and an inverter 51;
a first terminal of the first control switch Q1 is connected to the output terminal of the control module 4, a second terminal of the first control switch Q1 is used for inputting a supply voltage, and a third terminal of the first control switch Q1 is connected to the first terminal of the inductor L1;
the input end of the inverter 51 is connected to the output end of the control module 4, the output end of the inverter 51 is connected to the first end of the second control switch Q2, the second end of the second control switch Q2 is grounded, and the third end of the second control switch Q2 is connected to the first end of the inductor L1.
When the output end of the control module 4 outputs a high level, the first terminal of the first control switch Q1 is at a high level, the first control switch Q1 is turned on, and the third terminal of the first control switch Q1 outputs a high level; meanwhile, the input end of the inverter 51 inputs a high level, the output end of the inverter 51 outputs a low level, and the first end of the second control switch Q2 is at a low level, so that the first end of the inductor L1 is isolated from the ground, and thus the power switch circuit 5 outputs a high level, which can increase the output voltage. When the output end of the control module 4 outputs a low level, the first terminal of the first control switch Q1 is at a low level, the first control switch Q1 is turned off, and the third terminal of the first control switch Q1 outputs a low level; meanwhile, the input end of the inverter 51 inputs a low level, the output end of the inverter 51 outputs a high level, and the first end of the second control switch Q2 is at a high level, so that the first end of the inductor L1 is connected to ground, the power switch circuit 5 outputs a low level, and after a certain time, the output voltage is reduced.
Optionally, the first control switch Q1 is a MOS transistor, and the second control switch Q2 is a MOS transistor.
The first terminal of the first control switch Q1 may be a gate of a MOS transistor, the second terminal of the first control switch Q1 may be a drain of the MOS transistor, and the third terminal of the first control switch Q1 may be a source of the MOS transistor. The first terminal of the second control switch Q2 may be a gate of a MOS transistor, the second terminal of the second control switch Q2 may be a drain of the MOS transistor, and the third terminal of the second control switch Q2 may be a source of the MOS transistor.
Optionally, the linear amplification circuit 2 includes a linear envelope amplifier 21, a first input end of the linear envelope amplifier 21 is connected to the power input end 1, a second input end of the linear envelope amplifier 21 is connected to the power output end 6, and an output end of the linear envelope amplifier 21 is connected to the first input end of the error amplification circuit 3.
Wherein, the voltage difference value of the first input terminal and the second input terminal of the linear envelope amplifier 21 can be compared, and when the voltage value of the first input terminal of the linear envelope amplifier 21 is higher than the voltage value of the second input terminal of the linear envelope amplifier 21, the output terminal of the linear envelope amplifier 21 can output the envelope signal to the first input terminal of the error amplifying circuit 3; when the voltage value of the first input terminal of the linear envelope amplifier 21 is higher than the voltage value of the second input terminal of the linear envelope amplifier 21, the linear envelope amplifier 21 turns off the output. The linear amplification circuit 2 is formed by the linear envelope amplifier 21, and has the advantages of high working bandwidth, high linearity of output voltage and simple structure.
Optionally, the error amplifying circuit 3 includes an error amplifier 31 and a resistor R1;
a first terminal of the resistor R1 is connected to the output terminal of the linear amplifier circuit 2, a first terminal of the resistor R1 is connected to the first input terminal of the error amplifier 31, a second terminal of the resistor R1 is connected to the power supply output terminal 6, and a second terminal of the resistor R1 is connected to the second input terminal of the error amplifier 31;
the output of the error amplifier 31 is connected to a first input of the control module 4.
The linear amplifying circuit 2 needs to directly supply power to a load or a radio frequency PA, so that the resistance of the resistor R1 disposed between the output terminal of the linear amplifying circuit 2 and the power output terminal 6 cannot be too large, so as to prevent the voltage division of the resistor R1 from being too large, which results in too large output loss of the linear amplifying circuit 2, and the resistance of the resistor R1 may be set to 0.2 Ω, or may be set to 0.5 Ω, and so on. The resistance of the resistor R1 is small, the voltage across the resistor R1 is small and is not enough to turn on the first control switch Q1, the voltage across the resistor R1 is amplified by the error amplifier 31, and therefore the voltage output by the output end of the error amplifier 31 can reach the state of turning on the first control switch Q1.
The envelope tracking power supply can implement each process implemented by the envelope tracking power supply in the method embodiment of fig. 1, and is not described herein again to avoid repetition.
The embodiment of the invention also provides electronic equipment, and the electronic equipment comprises the envelope tracking power supply.
The electronic equipment further comprises a radio frequency PA, and the envelope tracking power supply is connected with the radio frequency PA and used for supplying power to the radio frequency PA. Since other structures of the electronic device are the prior art, the envelope tracking power supply has been described in detail in the above embodiments, and therefore, details of the structure of the electronic device in this embodiment are not described again.
Preferably, an embodiment of the present invention further provides an envelope tracking power supply, including: the power control method comprises a memory, a processor and a program stored on the memory and capable of running on the processor, wherein the program realizes the steps in the power control method according to the embodiment of the invention when being executed by the processor.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps in the power control method according to the embodiment of the present invention are implemented, and the same technical effects can be achieved, and are not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A power supply control method applied to an envelope tracking power supply, wherein the envelope tracking power supply includes an error amplification circuit, a power supply switching circuit, and a power supply output terminal, the power supply switching circuit being connected to the power supply output terminal via an inductor, the method comprising:
acquiring the output voltage of the power switch circuit;
under the condition that the output voltage of the power switch circuit is greater than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a target time T, wherein T is T plus delta T, T is the time when the output voltage of the power switch circuit is greater than the first preset voltage value, and delta T is preset duration;
under the condition that the input end of the power switch circuit inputs the closing signal, if the output voltage of the power output end is smaller than a second preset voltage value, controlling the input end of the power switch circuit to stop inputting the closing signal, and controlling the input end of the power switch circuit to input the output voltage of the error amplification circuit;
before the obtaining of the output voltage of the power switching circuit, the method further includes:
controlling the input end of the power switch circuit to input the output voltage of the error amplifying circuit;
acquiring the output voltage of the power switch circuit;
taking a first time T1 as a time starting point, acquiring a corresponding relation between the output voltage of the power supply output end and time, wherein T1 is the time when the output voltage of the power supply switch circuit is greater than a third preset voltage value;
and obtaining delta t according to the corresponding relation between the output voltage of the power supply output end and the time.
2. The method of claim 1, wherein the envelope tracking power supply further comprises a power supply input, and wherein obtaining Δ t from the output voltage of the power supply output versus time comprises:
acquiring a first time length delta t2 according to the corresponding relation between the output voltage of the power supply output end and time;
when the output voltage of the power switch circuit is greater than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a second time T2, wherein T2 is T +. DELTA.t 2;
updating the first time length Deltat 2 when the difference between the output voltage of the power supply output end and the target voltage is larger than a fourth preset voltage value, wherein the target voltage is in a proportional relation with the input voltage of the power supply input end;
and setting the value of the preset time length deltat as the first time length deltat 2 under the condition that the difference value between the output voltage of the power supply output end and the target voltage is smaller than or equal to the fourth preset voltage value.
3. An envelope tracking power supply, comprising an error amplification circuit, a power switching circuit, and a power output terminal, the power switching circuit being connected to the power output terminal via an inductor, the envelope tracking power supply further comprising:
a first acquisition unit configured to acquire an output voltage of the power switching circuit;
the power supply control circuit comprises a first control unit, a second control unit and a control unit, wherein the first control unit is used for controlling the input end of the power supply switch circuit to input a closing signal at a target time T under the condition that the output voltage of the power supply switch circuit is greater than a first preset voltage value, T is T + delta T, T is the time when the output voltage of the power supply switch circuit is greater than the first preset voltage value, and delta T is preset time length;
the second control unit is used for controlling the input end of the power switch circuit to stop inputting the closing signal and controlling the input end of the power switch circuit to input the output voltage of the error amplification circuit if the output voltage of the power output end is smaller than a second preset voltage value under the condition that the closing signal is input to the input end of the power switch circuit;
the envelope tracking power supply further includes:
the third control unit is used for controlling the input end of the power switch circuit to input the output voltage of the error amplification circuit;
the second acquisition unit is used for acquiring the output voltage of the power switch circuit;
a third obtaining unit, configured to obtain a corresponding relationship between an output voltage of the power output terminal and time by using a first time T1 as a time starting point, where T1 is a time when the output voltage of the power switch circuit is greater than a third preset voltage value;
and the fourth acquisition unit is used for acquiring delta t according to the corresponding relation between the output voltage of the power supply output end and time.
4. The envelope tracking power supply of claim 3, further comprising a power input, the fourth acquisition unit being configured to:
acquiring a first time length delta t2 according to the corresponding relation between the output voltage of the power supply output end and time;
under the condition that the output voltage of the power switch circuit is larger than a first preset voltage value, controlling the input end of the power switch circuit to input a closing signal at a second time T2, wherein T2 is T + delta T2;
updating the first time length Deltat 2 when the difference between the output voltage of the power supply output end and the target voltage is larger than a fourth preset voltage value, wherein the target voltage is in a proportional relation with the input voltage of the power supply input end;
and setting the value of the preset time length deltat as the first time length deltat 2 under the condition that the difference value between the output voltage of the power supply output end and the target voltage is smaller than or equal to the fourth preset voltage value.
5. An envelope tracking power supply, comprising: the device comprises a power supply input end, a linear amplifying circuit, an error amplifying circuit, a control module, a power supply switch circuit, an inductor and a power supply output end;
the first input end of the linear amplification circuit is connected with the power supply input end, and the second input end of the linear amplification circuit is connected with the power supply output end;
the first input end of the error amplifying circuit is connected with the output end of the linear amplifying circuit, and the second input end of the error amplifying circuit is connected with the power supply output end;
the first input end of the control module is connected with the output end of the error amplification circuit, the second input end of the control module is connected with the power supply output end, and the third input end of the control module is connected with the output end of the power supply switch circuit;
the input end of the power switch circuit is connected with the output end of the control module, and the output end of the power switch circuit is connected with the power output end through an inductor.
6. The envelope tracking power supply of claim 5 wherein the power switching circuit comprises a first control switch, a second control switch and an inverter;
a first end of the first control switch is connected with an output end of the control module, a second end of the first control switch is used for inputting a power supply voltage, and a third end of the first control switch is connected with a first end of the inductor;
the input end of the phase inverter is connected with the output end of the control module, the output end of the phase inverter is connected with the first end of the second control switch, the second end of the second control switch is grounded, and the third end of the second control switch is connected with the first end of the inductor.
7. The envelope tracking power supply of claim 5 wherein the linear amplification circuit comprises a linear envelope amplifier having a first input connected to the power supply input, a second input connected to the power supply output, and an output connected to the first input of the error amplification circuit.
8. The envelope tracking power supply of claim 5, wherein the error amplification circuit comprises an error amplifier and a resistor;
the first end of the resistor is connected with the output end of the linear amplification circuit, the first end of the resistor is connected with the first input end of the error amplifier, the second end of the resistor is connected with the power supply output end, and the second end of the resistor is connected with the second input end of the error amplifier;
and the output end of the error amplifier is connected with the first input end of the control module.
9. An electronic device, characterized in that the electronic device comprises an envelope tracking power supply according to any of claims 3-8.
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| CN103795356A (en) * | 2014-01-21 | 2014-05-14 | 浙江大学 | Envelope tracking radio frequency power amplifier |
| US9923520B1 (en) * | 2016-09-21 | 2018-03-20 | Qualcomm Incorporated | Switching power supply for RF power amplifiers |
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